Hello Mike, You may try to dilute standard positive resist with its solvent (e.g. AZ 1505 with PGMEA (AZ EBR Solvent)) to achieve such low thickness. I am not sure how good the film quality and coverage is but you may try it. Best regards, Daniel Figura smartfabgroup process consulting - data processing - fab software Phone: +44 20 3286 4342 E-mail: daniel.figura@smartfabgroup.com, Web: www.smartfabgroup.com -----Original Message----- From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org] On Behalf Of Michael Cooke Sent: Monday, February 08, 2010 5:37 PM To: mems-talk@memsnet.org Subject: [mems-talk] 50 nm resist Hi does any one know of a 50nm positive resist (for use in a standard UV mask aligner) ? Thanks Mike