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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/).
(a) Atomic Force Microscope (AFM) image showing large ordered regular arrays, with typical dimension of 50 µm × 50 µm, with a periodic pitch of about 1µm and amplitude of the wrinkle of ~ 200 nm. (b) Intensity of the transmittance diffraction at different applied strain levels.