  Effects of hard planar walls with a particle scale roughness on the spatial
correlations of non-affine strain in amorphous solids are investigated via
molecular dynamics simulations. When determined within layers parallel to the
wall plane, normalized non-affine strain correlations are enhanced within
layers closer to the wall. The amplitude of these correlations, on the other
hand, is found to be suppressed by the wall. While the former is connected to
the effects of a hard boundary on the continuum mechanics scale, the latter is
attributed to molecular scale wall effects on the size of the region (nearest
neighbor cage), explored by particles on intermediate times scales.
