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SEM micrographs of PS film with corresponding FFT images from AFM analysis: (a) before and after laser irradiation at pulse fluence F = 11.8 mJ/cm2, repetition rate of 50 Hz for pulse number N: (b) 5 × 103, (c) 10 × 103, (d) 15 × 103, (e) 25 × 103, and (f) 35 × 103.
