Explain your problem a bit more eloquently. Your email doesn't seem to elucidate on the problem that you are experiencing. ******************************************************************************* Rajib Ahmed 347 Hopeman Engineering Building Department of Electrical and Computer Engineering University of Rochester Rochester, NY 14627-0167 Email:rajib@ece.rochester.edu Phone#:(585)224-6538 Fax#:(585)273-4919 ******************************************************************************* On Sat, 23 Dec 2006, abhaya joshi wrote: > hi guyes, > i am having a problem. > i am doign lithography on surface, which is having 20um deep cavities. i > have to put photoresist on that.but while doing lithography the photoresist > at corner (at top surface). > i am using positive resist S1813 and spinning at speed of 3000RPM. > can anybody tell me what is the problem? > -abhay joshi > university of pune.