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Polar and nonpolar phases upon different stacking. (A) Interlayer differential charge density of ABC and AB stacking bulk BN, where blue and yellow isosurfaces indicate electron depletion and accumulation after layer stacking, respectively. (B) Bulk MoS2 of different stacking configurations. (C) Trigonal and hexagonal SnS2. (D) Orthorhombic and monoclinic WTe2. (E) R-type and H-type CrI3/CrBr3.
