Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2007.570.5742) Thin Film]]>UgwuE.I.UduhP.C.AgboG.A.4200774Wave propagation in inhomogenous feS_{2} film was studied and the influence of the change in the refractive index introduced as a perturbation on EM wave propagating through the film. The solution of the scalar wave equation was obtained first using series expansion solution method of Green’s function with appropriate boundary condition. The result was written as sources of two fields where the second term was considered to be correction term due to the perturbation or small change in the refractive index. The influence of large step in refractive index and surface impedance offered by the film medium to the propagating wave was discussed.]]>Leonard, I.S.,1955Ugwu, E.I. and P.C. Uduh,20052 thin film deposited by solution growthtech.]]>Ugwu, E.I.,2005Butko, E.,1968Feit, M.D. and J.A. Fleck Jr.,1979Feit, M.D. and J.A. Fleck Jr.,1979Feit, M.D. and J.A. Fleck Jr.,1980Van Roey, J., J. van der Donk and P.E. Lagasse,1981Ishimaru, A., J.D. Rockway and Y. Kuga,2000