The structure of cobalt layers grown on a Pd͕100͖ single-crystal surface has been studied by scanned angle x-ray photoelectron diffraction. At room temperature the cobalt layers grow in a structure related to the bulk cobalt fcc phase characterized by a large expansion of the in-plane lattice parameters and a corresponding contraction of the interlayer spacing ͑ϳ10%͒. This structure persists to coverages greater than 30-layer equivalents, and can be interpreted as a metastable body-centered-tetragonal ͑bct͒ phase. ͓S0163-1829͑96͒06339-4͔

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