Simulation on a monolayer

Hello MPB Users and Steven,

    How exactly would I go about simulating the band structure of a 
monolayer of particles, say a monolayer of dielectric spheres? I don't want 
to use the no-size, because that would just make my structure into rods. I'm 
interested in the seeing photonic properties of the three dimensional 
monolayer structure.  Would I just set the vector perpendicular to the layer 
to infinity or a very large value?

Thanks,

Ian