  The IceCube Neutrino Observatory at the South Pole has measured the diffuse
astrophysical neutrino flux up to ~PeV energies and is starting to identify
first point source candidates. The next generation facility, IceCube-Gen2, aims
at extending the accessible energy range to EeV in order to measure the
continuation of the astrophysical spectrum, to identify neutrino sources, and
to search for a cosmogenic neutrino flux. As part of IceCube-Gen2, a radio
array is foreseen that is sensitive to detect Askaryan emission of neutrinos
beyond ~30 PeV. Surface and deep antenna stations have different benefits in
terms of effective area, resolution, and the capability to reject backgrounds
from cosmic-ray air showers and may be combined to reach the best sensitivity.
The optimal detector configuration is still to be identified.
  This contribution presents the full-array simulation efforts for a
combination of deep and surface antennas, and compares different design options
with respect to their sensitivity to fulfill the science goals of IceCube-Gen2.
