  We show that a domain wall separating single layer graphene (SLG) and
AA-stacked bilayer graphene (AA-BLG) can be used to generate highly collimated
electron beams which can be steered by a magnetic field. Such system exists in
two distinct configurations, namely, locally delaminated AA-BLG and terminated
AA-BLG whose terminal edge-type can be either zigzag or armchair. We
investigate the electron scattering using semi-classical dynamics and verify
the results independently with wave-packed dynamics simulations. We find that
the proposed system supports two distinct types of collimated beams that
correspond to the lower and upper cones in AA-BLG. Our computational results
also reveal that collimation is robust against the number of layers connected
to AA-BLG and terminal edges.
