Sr2CuO2Cl2. Signifies a nearly ideal case of a 2-D antiferromagnetic CuO2-plane and therefore is of certain fascination from the context in the origins of high TC superconductivity. We use the single-site impurity Anderson model with five Cu 3d orbitals and O 2p valence bands specified because of the irreducible representations https://okada4dsg.com/