Phase (left) and amplitude (right) piezoresponse force microscopy images for the six sample variants. (a),(b) Vertical scan of single-layer PbZr0.2Ti0.8O3; (c),(d) vertical scan of single-layer PbZr0.8Ti0.2O3;
(e),(f) vertical scan of an up-bilayer; (g),(h) lateral scan of a down-bilayer; (i), (j) vertical scan of an up-graded heterostructure; (k),(l) lateral scan of a down-graded heteorstructure.

Image Credit: University of Illinois at Urbana-Champaign.

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