Correct Answer - Option 4 : (A) and (B) only
Adhesive layer: It is a thin film of tungsten, niobium, chrome, or titanium. The gold layers are generally about 1 μm thick.
It is a tendency of dissimilar particles or surfaces to cling to one another.
- Materials like Cr, Ni, Al, TiN, WSi2 have a good adhesion layer on SiO2.
- Both Ni and Cr require high temperatures for melting and evaporation.
- It is easy to thermally evaporate chromium using chrome-plated tungsten.
- Generally, W and Mo do not reduce SiO2 and have poor adhesion on the SiO2 surface.
Option (4) correct.