VCE method was extended to treat antiferromagnetic-paramagnetic transition,
so that it is not only able to calculate the Curie temperature but also th
e Neel temperature. The formulas for calculating critical temperatures of r
andom-bound layered Ising model, which describes the phase transition in ma
gnetic alloy film, were provided. Some T-c-chi phase diagrams for magnetic
alloy film were investigated and discussed.