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The EPR g-factors g(parallel to), g(perpendicular to) and hyperfine structure constants A(parallel to), A(perpendicular to) for a tetragonal Co2+ impurity center (i.e. Co2+ (II) center) in AgCl crystal are calculated by using the perturbation formulas of EPR parameters for the 3d(7) ion in tetragonal symmetry obtained from the cluster approach. Based on the calculations, the defect model for the center is suggested as a substitutional Co2+ ion associated with a nearest neighbour O2- ion. (C) 2001 Elsevier Science B.V. All rights reserved.