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. 2023 May 5;23(9):4489. doi: 10.3390/s23094489

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© 2023 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 (https://creativecommons.org/licenses/by/4.0/).

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Texture direction representation (based on the Fourier Transform) and texture isotropy representation (based on the autocorrelation function) supported by the AFM topography images, obtained for the phase mask laser, irradiated Az_0.25PSS-L (a,a1), Az_0.50PSS-L (b,b1), Az_0.75PSS-L (c,c1), and Az_1.00PSS-L (d,d1). The angles are measured anticlockwise. Same as in texture direction representation, in the texture isotropy representation, the black lines indicates the positions of the main angle lines (0°, 30°, 60°, 90°, 120°, 150°, 180°), the dotted orange lines indicates the positions of the intermediary angle lines and the red lines delimits the periodic motif.