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However, birefringent films typically retain only \u223c20% of bulk crystal performance, which consequently limits film\u2010based birefringence to values rarely exceeding 0.1. To address this limitation, we introduce a two\u2010dimensional van der Waals (2D\u2010vDW) organic metal chalcogenide (OMC)\n                    <jats:bold>PbHBT<\/jats:bold>\n                    (HBT = 4\u2010mercaptophenol), featuring \u201cmolecular\u2010scale superlattices\u201d of alternating inorganic PbS and organic Ph\u2010OH ligands.\n                    <jats:bold>PbHBT<\/jats:bold>\n                    crystal exhibits a birefringence of 0.39@546\u00a0nm. A nanoscale thickness\u2010controllable, highly oriented\n                    <jats:bold>PbHBT<\/jats:bold>\n                    film was prepared through an economical in situ layer\u2010by\u2010layer (LBL) spin\u2010coating liquid\u2010phase epitaxy (LPE) approach. The birefringence of the\n                    <jats:bold>PbHBT<\/jats:bold>\n                    film is 0.3 at 546\u00a0nm, maintaining 77% of the birefringence of its bulk crystal. Importantly, the\n                    <jats:bold>PbHBT<\/jats:bold>\n                    film achieves a birefringence of 0.65 in the visible spectrum and 0.43 in the near\u2010infrared, which are the highest notes ever achieved by a birefringent film. This excellent birefringence performance stems from the anisotropy of the electron cloud density of different crystal planes of the\n                    <jats:bold>PbHBT<\/jats:bold>\n                    and the high consistency of grain orientation after being fabricated into a film. This work opens avenues for thin\u2010film birefringent materials with large intrinsic birefringence and high retention, bridging the bulk\u2010film performance gap.\n                  <\/jats:p>","DOI":"10.1002\/anie.9163811","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T11:19:52Z","timestamp":1788261592000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Organic Metal Chalcogenide Films With Giant Birefringence"],"prefix":"10.1002","volume":"65","author":[{"given":"Zhi\u2010Qing","family":"Lan","sequence":"first","affiliation":[{"name":"State Key Laboratory of Structural Chemistry Fujian Provincial Key Laboratory of Materials and Techniques toward Hydrogen Energy Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences  Fuzhou China"},{"name":"University of Chinese Academy of Sciences (UCAS)  Beijing 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