The growth of Pt(lll) by Pt vapour deposition is studied by He diffraction as a function of substrate temperature and deposition rate. At a deposition rate of about 2.5 x 10 -2. monolayers/second several growth modes are observed: layer-by-layer (2D-) growth at 450 K ~ 450K enabling interlayer mass transport which leads to 2D-growth. The reentrant 2D-growth occurs due to a break down of this barrier for small, irregularly shaped islands.
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