please find this paper

salaam

S. H. Lou, L. Tsang, C. H. Chan, and A. Ishimaru, "Application of finite element method to Monte Carlo simulations of scattering of waves by random rough surfaces with the periodic boundary condition," Journal of Electromagnetic Waves and Applications, 5 ( 8 ) , 835-855, 1991.

thanks

http://www.ingentaconnect.com/content/vsp/jew

only this number of this year, number 8 is not available in electronic format. sorry.

Volume 5

Numbers 4-5, 1991