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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/).
Defects and microstructures of G-layered specimens. Each area in (a) is magnified by a factor of 200 in images (b–g) and by a factor of 800 in images (b1–g1).