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As an important surfactant, Pb surface alloying in surfactant-assisted epitaxy growth was studied by synchrotron radiation photoemission. As annealing causes the submonolayer Pb, distributed as two-dimensional islands on Cu(111), to form Pb–Cu surface alloy, Cu growth is also found to activate the Pb–Cu surface alloy formation on submonolayer Pb covered Cu(111). Whereas, different from the fact that...
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