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Amplitude of the spatial Fourier component with q1 = 0.0228 μm−1 of the interface modulation (○) vs. time, when a 60-s UV-thermal perturbation with q1 is applied at tR = 300 s, 900 s, 1,500 s, 2,100 s, 2,700s, 3,600 s, and 4,500 s. Exponential fits to Aq1 (t) = Ce−aq1(tR)t after each perturbation time tR with aq(tR) as a free parameter (solid line), and aq(tR) given by the WL calculation (dashed line).
