Ellipsometry would be the most appropriate. Some vendors might do a sample gratis, but you'd need to ask. Hope this helps. Jim -----Original Message----- From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org]On Behalf Of Aashish Singh Sent: Monday, January 03, 2005 8:14 AM To: MEMS-talk@memsnet.org Subject: [mems-talk] measuring film thickness and Refractive index after spin coating Dear friends, I have spin coated a thin Layer of PMMA over Quartz block in my laboratory. I want to measure the film thickness and Refractive index, can anybody suggest some way of doing it. Your help will be heartly appreciated. regards Aashish Singh Project Associate Department of Physics Indian Institute of Technology, Delhi New Delhi-16 INDIA _______________________________________________ MEMS-talk@memsnet.org mailing list: to unsubscribe or change your list options, visit http://mail.mems-exchange.org/mailman/listinfo/mems-talk Hosted by the MEMS Exchange, providers of MEMS processing services. Visit us at http://www.memsnet.org/