Dear all,

I am using the Build Layer tool in Materials Studio to build a two-layer structure, as shown in the attached Fig. 1.

My question is if the current vacuum layer thickness (+Z direction) is not enough, and I would like to add an additional vacuum slab, how could I realize it?

Besides, whether I can add a vaccum slab in the -Z direction?  Then I could have a symmetric vacuum layer in +Z and -Z direction.

An additional question is about the dynamic run. I built a structure as shown in Fig. 1, and then I did the geometry optimization and a NVT dynamic run for 50ps for equilibrium. In the resulting .xtd file or the last frame. xsd file after dynamic run, I fould some atoms were "absorbed" into the vaccum,  does it make sense, or how could I explain this phenomenon? Because vaccum here is to make sure non-bond interactions from the bottom layer do not influence the top layer (cited from tutorial of Confined Shear), but if I built a three layer system for confined shear task, after the dynamic run, it happened again. Anyone could help me out of this?

Ideas and advice are welcome and greatly appreciated.

Thanks in advance,

Guangji