Surface plasmons in metallic films of arbitrary thickness with mirror   boundary conditions
  A metallic film of arbitrary thickness is considered. We show that the problem of description of surface plasma oscillations (surface plasmons) with reflection boundary conditions allows analytic solution. Besides, this problem allows generalization for more general case of conducting matter (in particular, and for semiconductors). 
A. V. Latyshev and A. A. Yushkanov
physics.plasm-ph physics.optics