Controlled Growth of Patchy Nanosheets via Crystallization‐Driven Self‐Assembly of POSS‐Containing Block Copolymers

-KPOM featuring polyoxometalate (POM)-based coronas. This sequential epitaxial growth enables precise control over the lateral dimensions and patch thickness through multiple growth cycles. Our work demonstrates the feasibility of heteroepitaxy in precision molecular systems and establishes a versatile route toward multifunctional 2D nanomaterials with spatially encoded chemical complexity, opening new avenues for the rational design of hierarchical nanostructures.