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However, the relatively low thermal stability of these polymers has limited the direct epitaxial growth of high\u2010quality functional oxides. To overcome this bottleneck, mica has been gradually adopted as a two\u2010dimensional flexible platform, because of its atomically flat surface, excellent thermal stability, and the unique van der Waals interlayer interaction. In this review, recent progress on the use of mica as a flexible substrate for inorganic ferroelectric oxide thin films is systematically summarized. The van der Waals epitaxy mechanism and the release of the substrate clamping effect are first discussed, followed by recent developments of flexible ferroelectric memories and high\u2010energy\u2010storage dielectric capacitors, piezoelectric and electrocaloric coupling films, multiferroic and flexoelectric heterostructures, and pyroelectric thermal\u2010electric conversion. The potential of such mica\u2010based fully inorganic ferroelectric films for extreme\u2010environment and space\u2010electronics applications is also briefly addressed. This review aims to provide a structured overview of this emerging research field, known as \u201cMICAtronics\u201d.<\/jats:p>","DOI":"10.1002\/smll.76187","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T13:13:48Z","timestamp":1791983628000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Flexible Polar Materials on Mica"],"prefix":"10.1002","author":[{"given":"Yi\u2010Cheng","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Physics National Taiwan Normal University  Taipei Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3435-9084","authenticated-orcid":false,"given":"Ying\u2010Hao","family":"Chu","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering National Tsing Hua University  Hsinchu Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,14]]},"reference":[{"key":"e_1_2_14_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.flatc.2017.06.003"},{"issue":"38","key":"e_1_2_14_3_1","first-page":"39856","article-title":"Superconductive MgB2 Intercalated Muscovite with Dynamically Tunable Stress","volume":"9","author":"Kuo S.\u2010H.","year":"2024","journal-title":"ACS Omega"},{"key":"e_1_2_14_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0040-6090(92)90872-9"},{"key":"e_1_2_14_5_1","doi-asserted-by":"crossref","DOI":"10.1002\/adfm.202600001","article-title":"MICAtronics: A Flexible Electronics Platform","author":"Chen Y. 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