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. 2021 Feb 27;13(5):740. doi: 10.3390/polym13050740

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© 2021 by the authors.

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/).

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(a) Sample observation direction of surface roughness and examples of 3D surface roughness profiles: (b) 3D surface roughness profile from width side; (c) 3D surface roughness profile from thickness side.