Many thanks for your elaborate suggestion, Daniel. I am trying to pattern 5 um feature size at the bottom of the trench. I am using Karl Suss MA6 Mask Aligner. Since my feature size is 5 um, its not possible to make use of the suggested technique. Also I dont have access to the internal parts of the system. -Malar _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk