The assumption that minute defects and impurities may be the cause for discrepancies between experiment and theory on physisorbed films is confirmed for the first time in direct experiments. A change of 30^∘{} in the orientation of a Kr layer on Pt(111) induced by H and CO precoverages as low as 0.1%, via the blocking of step sites, is demonstrated by high-resolution He diffraction.
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Kern et al. (1986) studied this question.
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