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The reduction of disordered and ordered tin oxide monolayers and multilayers on Pt(111) by H2 was studied in situ by ambient pressure X-ray photoelectron spectroscopy. The disordered tin oxide monolayer was highly reactive and reduced by 5.5 × 10−7 Torr H2 at 295 K. However, the ordered monolayer was much less reactive, and nearly inert even in 2.2 Torr H2 at 295 K. Reduction of the tin oxide monolayer...