Preliminary results on the atomic decoration of a random-cluster model for icosahedral-phase alloys are presented. The calculated neutron and x-ray intensities compare quite favorably with experimental intensity data on i-AlMnSi. The origin of the peak at Q=1.62 A^-1, associated with the prepeak found in ``amorphous'' AlMnSi, as well as the ubiquitous ``diffuse'' scattering, seen experimentally under the groups of strong peaks in all icosahedral-phase alloys, are revealed selectively in the calculated partial intensities for Al-Al, Al-Mn, and Mn-Mn correlations.
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Robertson et al. (1991) studied this question.
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