We show that the step-edge velocity is coupled to the terrace length, and that there is a variation in the velocity from larger step spacing at the center of crystalline mounds to closely-spaced, more slowly propagating steps at their edges. Step-flow is observed through measurement of the step-edge velocity in the late stages of growth after crystalline mounds have formed. Here we report results for vacuum deposition of C 60 on a graphene-coated surface investigated with X-ray Photon Correlation Spectroscopy in surface-sensitive conditions. Coherent X-rays provide an approach to better understand such processes and fluctuations far from equilibrium. The properties of artificially grown thin films are strongly affected by surface processes during growth.
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