Power spectral density of the simulated micro-roughness structure, as a function of spatial frequency fr. The frequency domain is restricted to fl = 1/2sA = 2.70 × 104 m−1 – for N = 213 and sA = 18.5 μm. The red line shows the model curve , with our selected A, B, and C parameters. Light gray: radial cut of one random realization 𝒫h. The dark gray line shows the average of 100 random realizations.
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