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Challenging our understanding of epitaxy on clean and O-precovered Pt (111), the ab initio Schwoebel barrier calculated for downward self-diffusion across A-type steps on Pt (111) is only E^S (A) 0. 02eV. Geometric arguments explain why E^S (B), the Schwoebel barrier at B-type steps, is more than an order of magnitude larger than E^S (A).
Peter J. Feibelman (Mon,) studied this question.