Song, YX (reprint author), SICHUAN UNIV,DEPT PHYS,CHENGDU 610064,PEOPLES R CHINA.
Described is a scheme of successive approximations used to compute a critical point. An order parameter J is introduced automatically in the cumulant expansion. The critical temperature T-c is determined by the singular point of the curve of J versus temperature. This method is applied to (d + 1)-dimensional Ising layers. T-c as an analytical function of d is obtained for a system of uniform layers. A more realistic case, which lacks the layer to layer symmetry, is also investigated.