Surface EM waves in 1D Photonic Crystals
  Accurate analytic approximations are developed for the band gap boundaries and surface waves of a 1D photonic crystal, making use of the semiclassical theory recently developed by the authors: [Phys. Rev. E {69} (2004) 016612 and {70} (2004) 016606]. These analytic results provide useful insight on systematics of surface states. 
J. Martorell, D. W. L. Sprung and G. V. Morozov