Abstract
The LEED diagram observed for S/Pt(110) in the 4 12 − 5 12 coverage range shows a small coincidence unit mesh with some zero intensity spots. It can be interpreted by partial disorder and occupancy modulations. Two different methods of investigation have been used to get a structure model. The major part of this model is made of ordered structural elements of the configurations corresponding to the lower and higher concentrations and belonging to a single preponderant antiphase. The remaining part is made of atoms belonging to the other antiphases which are disordered with respect to the preponderant region. A unique system of modulations is obeyed in all regions, which combine to produce the zero intensities of the missing spots.
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