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The cover shows how the segregation of atoms to the surface of the binary rare-gas cluster varies with both the atomic size ratio (vertical arrow, σBBAA) and the relative strength of the pair interactions (horizontal arrow, ϵBBAA); σBBAA = 1.0, 1.02, 1.04, 1.06, and 1.08, and ϵBBAA = 1.0, 1.15, 1.25, 1.35, and 1.45. The work by Jorge M. C. Marques and Francisco B. Pereira on page 505 employs an evolutionary algorithm to search for the global minimum structure of mixed Ar-Kr, Ar-Xe, and Kr-Xe clusters modeled with different potential functions. The influence of key features of the potential (e.g., σBBAA or ϵBBAA) on both structural and energetic properties of the clusters are assessed.