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Initial surface topography of two different samples polished by different procedures (Mechanical polishing in (a) and Electrochemical in (c)). Arithmetic roughness (Ra) and Kurtosis (Ku) were measured and compared for both samples. (b,d) 2D and 3D SEM images of (a,c) respectively after laser irradiation. The crucial role of initial type of roughness is observed by comparing the nanostructures concentration in the SEM.
