In the following the program flow of some important functions is sketched

1. Read current state from the graphical user interface and check values.
2. if “Set optical constants automatically is turned on”
   1. Read .db or .e files of each layer. If no file found display error message.
   2. if magnetization is turned on read .m files of each layer. If no file found display error message.
3. Fill dielectric tensor with proper values of the diagonal and off-diagonal elements.
4. abcd
5. abcd