Abstract
The diffuse LEED intensity depends on the pair correlation functions at the surface which describe the random distribution of occupied sites of chemisorbed atoms or molecules. The diffuse SPLEED intensity and its asymmetry with respect to the spin polarization depends on the pair correlation functions which describe both the topological as well as the magnetic order at the surface. Thus, the topological correlations play an essential role in the considerations of the diffuse LEED or in the description of the predicted properties for the diffuse SPLEED intensity. The discussion is based on the model for the magnetic samples with a random distribution of spin orientations at the surface.
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