You should be able to use PR as a mask for a trench that shallow. Have you
tried it yet?

Jesse Fowler
  UCLA/MAE Dept., 420 Westwood Plaza, Room 37-129, ENGR IV
  Los Angeles, CA 90095-1597 | (310)825-3977
"Observations of nature, no matter how seemingly arcane, are like
peeling off one more layer from the great onion of knowledge"
    -- Don Petit, ISS science officer

On Tue, 20 May 2003, Zhang wrote:

> hi:
>
> Who know how to use BOE etch 3000A glass.
> thank you
>
> Zhang
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