Sr2CuO2Cl2. represents an almost great case of a 2-D antiferromagnetic CuO2-plane and so is of particular curiosity in the context on the origins of significant TC superconductivity. We use the single-site impurity Anderson product with 5 Cu 3d orbitals and O 2p valence bands specified because of the irreducible representations https://okada4dsg.com/