What tape do you use for adhesion test?

----- Original Message -----
From: "ahajjiah" 

> Dear members of the MEMS community,
>
> I am using e-beam to deposit Ni(1.5kA) on GaN. My Chamber pressure is below
> 1e-6 and my deposition rate is below 10A/s. I have done the tape test on the
> sample and found out that my metal is not sticking very well to the sample.