The perturbation formulas of the EPR g factors for a 4f(3) ion in orthorhombic symmetry are established, by considering the contributions from the admixtures of various states. The formulas are applied to the studies of the g factors for the orthorhombic NdBa2Cu3O7. The related crystal-field parameters in the calculations are obtained from the superposition model and the local structural data of the orthorhombic Nd3+ site in NdBa2Cu3O7. The calculated g factors are in reasonable agreement with the observed values. The theoretical results are discussed.
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