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Total friction (Γt) at Vts = φ +0.5V plotted on a log-log scale for (a) 350 nm PMMA on a Au(111)/mica substrate (squares) and 40 nm of Au, thermally evaporated onto 350nm of PMMA on a quartz substrate (filled squares). (b) 150 nm epitaxial Au(111) on mica (diamonds) and 30 nm PS on an Au(111)/mica substrate (circles).
