1. Department of ChemistryTemple University Beury Hall Philadelphia PA 19122 USA
2. Center for the Computational Design of Functional Layered Materials (CCDM)Temple University, Philadelphia PA 19122 USA
3. Theoretical Sciences UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur 560 064 India
4. Chemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur 560 064 India
5. Department of PhysicsTemple University Philadelphia PA 19122 USA