  Highly-anisotropic plasmonic nanotubes exhibit a dramatic drop of the
scattering cross section in the transition regime from hyperbolic to elliptic
dispersion. The characterization of a realistic multilayered metamaterial is
typically carried out by means of an effective medium approach providing
average components of the permittivity tensor and wave fields. Here, the edge
effects of the metal-dielectric stratified nanotube for different combinations
were thoroughly analyzed. We show how the boundary layers, which in principle
remain fully irrelevant in the estimation of the effective permittivity of the
nanotube, however play a critical role in the resonant scattering spectra and
the near field patterns. A remarkable enhancement of the scattered wave field
is unexpectedly experienced at the frequencies of interest when a dielectric
layer is chosen to be in contact with the cavity core.
