I want to create circular regions in a two-dimensional simulation and in a rectangular simulation box and place atoms in those circular regions, how can I do this?
How about using a cylinder region?
I want to create nanoparticles and i want my nanoparticles to be circular. How can I create circular nanoparticles in 2d simulation?
If you are discarding advice been given, you have to explain why?
Your description is quite vague. Can you be more specific?