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Whilst flat bands are experimentally realized in 2D twisted van der Waals heterostructures, they are highly sensitive to twist angle, necessitating complex fabrication techniques. Geometrically frustrated kagome lattices have emerged as an attractive alternative platform as they can natively host flat bands that are observed experimentally in quasi\u20102D bulk\u2010crystal kagome metals. An outstanding experimental question is whether flat bands can be realized in ultra\u2010thin metals, with opportunities for stronger electron\u2013electron interactions through tuning of the surrounding dielectric environment. Here, angle\u2010resolved photoelectron spectroscopy, scanning tunnelling microscopy, and band structure calculations are used to show that ultra\u2010thin films of the kagome metal Mn\n                    <jats:sub>3<\/jats:sub>\n                    Sn host a robust dispersionless flat band with a bandwidth of 50 meV. Furthermore, chemical tuning of the flat band to near the Fermi level via manganese defect engineering is demonstrated. The realization of tunable kagome\u2010derived flat bands in an ultra\u2010thin kagome metal represents a promising platform to study strongly correlated and topological phenomena, with applications in quantum computing, spintronics and low\u2010energy electronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.202516003","type":"journal-article","created":{"date-parts":[[2025,11,27]],"date-time":"2025-11-27T11:41:40Z","timestamp":1764243700000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["3D Flat Band in Ultra\u2010Thin Kagome Metal Mn\n                    <sub>3<\/sub>\n                    Sn Film"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1782-0756","authenticated-orcid":false,"given":"Mengting","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton VIC 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Blyth","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton VIC 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianye","family":"Yu","sequence":"additional","affiliation":[{"name":"Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences  Shenyang 110016 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Grace L.","family":"Causer","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton VIC 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongrun","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physics Beihang University  Haidian Beijing 100191 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiayu","family":"Liu","sequence":"additional","affiliation":[{"name":"Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences  Shanghai 201210 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenchuan","family":"Jing","sequence":"additional","affiliation":[{"name":"Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences  Shanghai 201210 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad T. H.","family":"Bhuiyan","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton VIC 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zheng\u2010Tai","family":"Liu","sequence":"additional","affiliation":[{"name":"Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences  Shanghai 201210 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mao","family":"Ye","sequence":"additional","affiliation":[{"name":"Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences  Shanghai 201210 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Du","sequence":"additional","affiliation":[{"name":"School of Physics Beihang University  Haidian Beijing 100191 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiping","family":"Yin","sequence":"additional","affiliation":[{"name":"School of Physics &amp; Astronomy and Center for Advanced Quantum Studies Beijing Normal University  Beijing 100875 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael S.","family":"Fuhrer","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton VIC 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anton","family":"Tadich","sequence":"additional","affiliation":[{"name":"Australian Synchrotron  Clayton VIC 3168 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark T.","family":"Edmonds","sequence":"additional","affiliation":[{"name":"School of Physics and Astronomy Monash University  Clayton VIC 3800 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,11,27]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-022-05516-0"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/qute.202100073"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.abc1977"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-020-20838-1"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41567-023-02053-z"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-021-04105-x"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.78.125104"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevResearch.3.033260"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41567-018-0355-x"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms13908"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.129.196801"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-021-25438-1"},{"key":"e_1_2_9_13_1","volume":"8","author":"Po L. 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