Abstract
For pt.I see abstr. A12890 of 1975. LEED I(V) calculations have been performed for the MgO(100) surface at normal incidence. Various models were tried and the best of these gave good agreement between theory and experiment. On allowing the top layer to relax by +or-3%, this agreement deteriorated, suggesting that the MgO(100) surface is little distorted from a simple termination of the bulk.