I wonder if there is any info available on the reflectivity versus Aluminum thickness coated on polished silicon surface. Also do I need an adhesion layer and thickness of it between Aluminum and silicon?Silicon thickness is between 75~200um. The desire wavelength is 600~800nm. Thanks! Kimi ----------------------------------------------------------------- 每天都 Yahoo!奇摩 海的顏色、風的氣息、愛你的溫度,盡在信紙底圖 http://tw.promo.yahoo.com/mail_premium/stationery.html