We present the anharmonicity and roughening of Cu surfaces derived from the derivatives of the layer spacings and the surface energies with respect to temperature using the embedded-atom molecular dynamics method. The anharmonicity and roughening of the Cu(110) surface started to increase rapidly around 600 K and 1000 K respectively. In addition, we present the dependence of the surface energy on the temperature for the heteroepitaxial Au/Ag(110) system. The slope of the surface energy was found to be less pronounced compared with that of the free Ag(110) surface system.
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