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An Ising model on a square lattice is studied, where one row of horizontal bonds has an energy E₁^' different from all other horizontal bonds. The correlation of two spins is calculated in this row, resulting in exponents β and η which depend on E₁^'. The long-distance behavior of the correlation for fixed T≠Tc is found to have different forms depending upon the value of E₁^'.
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McCoy et al. (1980) studied this question.
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