A New Possible Approach in Kosterlitz-Thouless Transitions

A possible way to apply Suzuki's coherent-anomaly method in Kosterlitz-Thouless transitions is discussed. Saito's self-consistent approximation is developed into a series. Systematic decrease of the effective-field residue ξ of the correlation length ξ∼exp ξ(Kc − K)-1] is found which indicates that the true index is less than one.