1. See, for example,Handbook of Optical Constants of Solids, edited by E. D. Palik (Academic, New York, 1985).
2. IMD can be downloaded from http://www.bell-labs.com/user/windt/idl.
3. X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
4. IDL is available from Research System, Inc., Boulder, CO, http://www.rsinc.com.
5. See, for example, J. D. Jackson,Classical Electrodynamics, 2nd ed. (Wiley, New York, 1975), pp. 281–282.