Single crystal E.P.R. of Cu(II) in a very low symmetry ligand field is reported. The63Cu hyperfine andgfactors are found to be orthorhombic withgxx= 2·1009,gyy= 2·0811,gzz= 2·3919,Axx= 21·4 ± 0·4,Ayy= 10·0 ± 0·4,Azz= 108·0 ± 0·1 × 10-4cm-1. The magnitude of the principal values of the hyperfine tensor is one of the lowest ever reported for Cu(II) and is rationalized in terms of a mixeddx2-y2/dz2ground state. The 20 K optical bands have been assigned based on RT polarization characteristics and assumingCssymmetry for convenience.