Hi All, I was wondering why does Copper susbtrates require higher exposure dose. I understand that it has something to do with the reflection from the copper substrate. Can anyone explain it. Many Thanks, Ricky Anthony Tyndall National Institute Cork, Ireland _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk