Abstract
A theoretical description of incoherent spin dependent multiple scatteringof electrons at a single-crystal surface partially covered with adisordered overlayer is reported. A formalism in which occupation operatorsspecify the occupancy of a chemisorption site is used for the statisticaldescription of a disordered adlayer. The theory is based upon the conceptsused in multiple-scattering DLEED theory. In the present considerationsspin effects are introduced to this theory by using the time independentDirac equation. Thus, a simple expression for incoherent spin dependentintensity is obtained. The spin-orbit induced `up/down' asymmetry is thencalculated. As an example the particular case of CO/Pt(111) is examined. Itis found that diffuse SPLEED is sensitive to the geometrical parameterscharacterizing the substrate/disordered adsorbate system as well as to theparameters related to the statistical distribution of the occupiedchemisorption sites. It is demonstrated that the method is applicable toany disordered surface suitable for DLEED investigation and in this wayenlarges the number of experimental data convenient for disordered surfacestructure analysis.
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