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[en] The ESR study of Cu2+ doped sodium ammonium sulphate dihydrate has been done at room temperature. Two magnetically inequivalent sites for Cu2+ have been observed. The spin-Hamiltonian parameters have been determined with the fitting of spectra to rhombic symmetry crystalline field. The parameters are Cu2+ (I): gx=2.121, gy=2.138, gz=2.425, Ax=23x10-4 cm-1, Ay=54x10-4 cm-1, Az=92x10-4 cm-1; Cu2+ (II): gx=2.038, gy=2.061, gz=2.337, Ax=35x10-4 cm-1, Ay=57x10-4 cm-1, Az=100x10-4 cm-1. The ground state wavefunction has also been determined. The g-anisotropy has been evaluated and compared with the experimental value. With the help of optical study, the nature of bonding in the complex has also been discussed.