Co(lOTO) with close-packed rows separated by the oaxis distance is a hep analog to fee (110). In contrast to the (2x1) missing-row (MR) structures formed upon oxygen adsorption on several fee (110) surfaces, a novel type of MR reconstruction is revealed by scanning tunnel microscopy and low energy electron diffraction on Co(lOTO): The low coverage (2x1) O phase constitutes a double-layer MR structure with (2*1) MR configurations in the two topmost Co layers; it develops locally by moving every other atom of the topmost close-packed Co rows into respective short bridge sites of the layer underneath. Results on the c(2x4) and the high coverage (2x1) oxygen phases support this conclusion.
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