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On the basis of systematic low-temperature expansions "to all orders", it is shown that an infinite sequence of spatially modulated commensurate phases, with wave vectors (2j+1) a (j=0, 1, 2, ), occurs in simple, anisotropic Ising models with nn couplings J₀, J₁>0, in between spin- layers, and competing nnn interlayer couplings J₂=-kJ₁ along one axis. The free energies, interfacial tensions, and phase boundaries are found for low T in d>2 dimensions.
Fisher et al. (Mon,) studied this question.