Temperature dependence of intensities from silicon with glancing incidence HEED

Peak reflectivity for the 2nd to 7th order Bragg reflections of the hhh systematic set have been obtained at different temperatures. The results have been interpreted using an n-beam dynamical theory adapted to the Bragg case at glancing incidence. On the basis of this analysis it is concluded that the component of the mean-square vibrational amplitude of the surface atoms normal to the surface is about 40% greater than that of the bulk.