Follow this link: http://www.filmetrics.com/?_kk=thin%20film%20thickness%20measurement&_kt=f92a2d15-8f6f-4ed0-a108-210f68307df0&gclid=CK6nwcLfk88CFRMo0wod2MAPcA
instead of filmetrics or other devices of This kind, all methods I know need a minimum of calculation . Exemple the soaking method wich needs not much calculations