  We discuss the robustness of Majorana edge modes in a finite quantum nanowire
of cylindrical shape. The nanowire is modeled as a bidimensional cylindrical
shell of semiconductor material with proximity-induced superconductivity and an
intrinsic Rashba spin-orbit interaction. The latter is characterized by
effective electric and magnetic fields in transverse direction of the nanowire.
An applied external magnetic field pointing in an arbitrary orientation is also
assumed. The numerical diagonalization of the Hamiltonian allows us to study
the spectrum of the nanowire for different experimental configurations. The
Majorana modes prove robust against tilting of the magnetic field away from the
cylinder longitudinal axis, if the tilt direction is perpendicular to the
effective spin-orbit magnetic field, but fragile otherwise. On the other hand,
we find an increasing number of Majorana modes in the same cylinder edge for
increasing values of the nanowire radius. We refer to this phenomenon as
"stacking effect" and it occurs due to the orthogonality between Majorana mode
wave functions. In this manner, different Majoranas take complementary
positions on the nanowire surface.
