Surface impedance formalism permits to reduce the discretization volum
e in a finite difference time domain (FDTD) code. The method based on
the definition of surface impedances for plane waves at horizontal or
vertical polarizations, is introduced in FDTD algorithm, to model inte
rfaces between two media. In this paper, two dimensional and three dim
ensional results are compared to those computed with classical FDTD or
Fresnel reflection coefficients involving a Fourier transform.