Sr2CuO2Cl2. Signifies an almost best situation of a 2-D antiferromagnetic CuO2-plane and so is of individual curiosity from the context in the origins of large TC superconductivity. We use The only-site impurity Anderson design with 5 Cu 3d orbitals and O 2p valence bands specified via the irreducible representations in https://okada4dsg.com/