FIx Wall/Reflex.

Dear all,

i am trying to simulate with lammps a deposition, becouse i dont see deposit run good i try this.
i made a simulation with 3 areas 1-gaas sustrate, 2-a ga area and 3- a as area (see image).

i use the fix wall/reflex command :

fix muro all wall/reflect zhi EDGE
fix muro2 all wall/reflect zhi 300

the first, fix muro put a wall reflex in the upper area.
and i suppose that the second fix muro2 put a wall/reflex in the middle area between the ga and as atoms,
after some step i remove the second wall/reflect muro 2 with unfix muro2.

but when i analice the simulation, i see in the first step the As atoms (uppers) are translated to the botton area.

i think them the wall/reflex command reflex all atoms always not only if after move pass over it.
it is right?

there are some method for made that with this or other command.

With best regards,
Bernardo

deposiciongaas.jpg

Read the documentation (My emphasis):
Up to 6 walls or faces can be specified in a single command: xlo, xhi, ylo, yhi, zlo, zhi. A lo face reflects particles that move to a coordinate less than the wall position, back in the hi direction. A hi face reflects particles that move to a coordinate higher than the wall position, back in the lo direction.