2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155732We discuss the order parameter correlation function in the vicinity of continuous phase transitions using a two-parameter scaling form G(k) = k_c^{-2} g(kξ,k/k_c), where k is the wave-vector, ξis the correlation length, and the interaction-dependent non-universal momentum scale k_c remains finite at the critical fixed point. The correlation function describes the entire critical regime and captures the classical to critical crossover. One-parameter scaling is recovered only in the limit k/k_c->0. We present an approximate calculation of g(x,y) for the Ising universality class using the functional renormalization group.4 pages, 5 figures, revised version, to appear as Rapid Communication in Phys.Rev.EStatistical MechanicsHigh Energy Physics - Theorytext