  Boundary conditions for the Maxwell and Dirac fields at material surfaces are
widely-used and physically well-motivated, but do not appear to have been
generalised to deal with higher spin fields. As a result there is no clear
prescription as to which boundary conditions should be selected in order to
obtain physically-relevant results pertaining to confined higher spin fields.
This lack of understanding is significant given that boundary-dependent
phenomena are ubiquitous across physics, a prominent example being the Casimir
effect. Here, we use the two-spinor calculus formalism to present a unified
treatment of boundary conditions routinely employed in the treatment of
spin-1/2 and spin-1 fields. We then use this unification to obtain a boundary
condition that can be applied to massless fields of any spin, including the
spin-2 graviton, and its supersymmetric partner the spin-3/2 gravitino.
