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(a) Cu fcc (111) 4 × 4 model and 50%Cu50%Zn bcc (110) 3 × 3 model; (b) additional 1, 3, 4, 5, 7 and 9 Cu atoms (yellow) on Cu fcc and 50%Cu50%Zn bcc surfaces; (c) plot of energy change of fcc Cu, fcc CuZn and bcc CuZn surfaces when adding increased number of Cu atoms onto those surfaces.
