Hi; You can not obtain 65 um thick resist using single coating by AZ 9260. You have to coat multiple. Tolga YELBOGA Project Engineer Nanotechnology Researh Center Bilkent University Bilkent, Ankara 06800 TURKEY Voice: 90-312-290-1020 http://www.nanointurkey.com http://www.nanotam.bilkent.edu.tr -----Original Message----- From: Haixin Zhu [mailto:Haixin.Zhu@asu.edu] Sent: Friday, June 13, 2008 11:43 PM To: General MEMS discussion Subject: Re: [mems-talk] 20um features using AZP4620 Dear Chad, U are right. Though I succeeded in making 38um thick pattern with 20um feature size, there is still some problem with undercut of the pattern and bottom residue. I will try AZ 9260, and hoping you can send me your processing traveler so I can use as reference and start point. Thanks Michael