If bt negative angle you mean overhang for lift off.  You can not
achieve it by using negative resist.  Bill Moffat

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On
Behalf Of [email protected]
Sent: Wednesday, February 23, 2011 3:48 PM
To: Xiaohui Lin; General MEMS discussion
Subject: Re: [mems-talk] Image Reversal resist

Maybe you can choose SU-8 2005?

I think that if you choose any negative resist, you can perform negative
angle.