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Lateral superlattice effects are observed for image-state electrons on a stepped Cu(001) surface via angle-resolved two-photon photoemission. Adsorption of Na atoms ({~}0.01 ML) on the stepped surface enhances the step regularity, yielding clear zone folding with a reduced Brillouin zone given by the reciprocal step lattice. {} 1996 The American Physical Society.
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Wang et al. (1996) studied this question.
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