hi,guys Now I want to do si-si and si-glass wafer bonding.I donot know how to do alignment.someone told me i need etch alignment key on the wafer.someone told me to do alignment manually....I am not sure.some experienced people can tell me what is exact to do alignment before bonding.... Thanks Dlee _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com.