S4: Stanford Stratified Structure Solver (http://fan.group.stanford.edu/S4/)

A program for computing electromagnetic fields in periodic, layered
structures, developed by Victor Liu ([email protected]) of the
Fan group in the Stanford Electrical Engineering Department.

See the S4 manual, in doc/index.html, for a complete
description of the package and its user interface, as well as
installation instructions, the license and copyright, contact
addresses, and other important information.