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Platinum vapor deposited at submonolayer coverages on the basal plane (bp) of highly oriented pyrolytic graphite (HOPG) in ultrahigh vacuum (UHV) was characterized in situ by X-ray photoelectron spectroscopy (XPS) and in air by scanning tunneling microscopy (STM). The effect of defect sites on the electronic and morphological nature of these deposits was investigated by first sputtering the HOPG(bp)...