A metallic band having the d(z)(2)-symmetry was evidenced at the interface between a Cs film and the SrTiO3(001) substrate. The symmetry assignment was carried out with the dipole-transition selection rule, probed by polarization-dependent photoemission spectroscopy. The e(g)-derived state of the SrTiO3(001) crystal is likely to be a bonding state composed of Cs s-orbital and Ti d-orbital with the e(g) symmetry, as predicted theoretically. (C) 2016 Elsevier B.V. All rights reserved.