  Vector spherical wavefunctions were derived in closed-form to represent
time-harmonic electromagnetic fields in an orthorhombic dielectric-magnetic
material with gyrotropic-like magnetoelectric properties. These wavefunctions
were used to formulate the T matrix for scattering by a three-dimensional
object composed of the chosen material. Furthermore, a closed-form,
coordinate-free expression of the dyadic Green function for the chosen material
was derived. Expressions ascertained for the singularity behavior will be
useful for formulating volume integral equations for scattering inside the
chosen material. A bilinear expansion of the dyadic Green function was obtained
in terms of the derived vector spherical wavefunctions.
