This article is unavailable. R. Nilavalan and I. J. Craddock, Interpolation/Averaging in Non-orthogonal FDTD Algorithm, Microwaves and Optical technology Letters, Vol. 50, No. 4, pp. 846 – 851, April 2008. If you wish to obtain a copy please contact the author below: Rajagopal.Nilavalan@brunel.ac.uk