Hi, I'm wondering if some body is aware of some site for etch rate of different substrate by different etchant. I am particularly interested in etch rate of GaN by HF solution. regards, Amol -- _______________________________________________ Find what you are looking for with the Lycos Yellow Pages http://r.lycos.com/r/yp_emailfooter/http://yellowpages.lycos.com/default.asp?SRC =lycos10