By a redefinition of the basis functions given in Eq. (13) of my recent paper [J. Opt. Soc. Am. A 10, 2581 (1993)], the sector matrix t21(M) there can be inverted analytically.
© 1994 Optical Society of America
Lifeng Li, "Multilayer modal method for diffraction gratings of arbitrary profile, depth, and permittivity: addendum," J. Opt. Soc. Am. A 11, 1685-1685 (1994)