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, Univ cepted line 1 from the vapor. But the surface of a solid can go through different stages of disorder from the per-provided indirect evidence about the increase of disorder on Cu(1 1 0) between 227 and 727 C [5– 7]. The advent of UHV and modern surface analysis STM, low energy electron microscopy (LEEM) or surface X-ray diffraction have allowed observations of roughening phenomena down t