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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Definition of the coordinate of the four-layer piezoelectric cantilever—the first layer is the substrate, the third layer is the piezoelectric layer, and the second and fourth layer are electrodes; (a) side-view; (b) top-view.