I. Introduction
The simulation of electromagnetic scattering from dielectric rough surfaces is very tempting for applications in remote sensing of ocean, soil and ice.The calculation of full vector-wave scattering from a large surface is very demanding task.The difficulties in the problem lie on the large surface size and on the magnitude of the surface roughness.Solving a problem of this kind requires a lot of unknowns in order to get accurate and meaningful results.Thus, reduction on both computation time and data storage requirement is continuously sought.The surface integral equations are widely used to solve problems of electromagnetic scattering and their formulation is one way to make the simulation more efficient.