I have deposited about 200nm of Au and I am going to deposit another 200nm layer of Au on top of this layer. All deposition are with e-beam evaporation and are done in vacuum. I have two questions: 1- Do you know how the cohesion between these two layers is? 2- I am going to deposit the second (top) layer of Au, two or three weeks after depositing the first layer. Should I do any cleaning before depositing the second layer? I, personally, think it is not necessary, since Au is an inert material and there shouldn't be any layer formed on top of that, right? Thank you very much. Regards.