Unoccupied surface state on the (√3 × √3) R30° of 6H-SiC(0001) J.-M. Themlin, I. Forbeaux, V. Langlais, H. Belkhir and J.-M. Debever Europhys. Lett., 39 1 (1997) 61-66 Published online: 01 September 2002 DOI: 10.1209/epl/i1997-00314-9