  We introduce a pseudo-spin model for the argentophilic bond expected in
silver-based bilayered materials arising from a spontaneous pseudo-magnetic
field interacting with pseudo-spins of two unconventional Ag ions, namely $\rm
Ag^{2+}$ and $\rm Ag^{1-}$ electronically distinct from (albeit energetically
degenerate to) the conventional $\rm Ag^{1+}$ cation typically observed in
monolayered materials. This model suggests the possibility of tuning the
dimensionality and hence the conductor-semiconductor-insulator properties of
honeycomb bilayered materials by application of external fields, analogous to
driving a superconducting or Coulomb blockade system to the normal regime by
critical magnetic or electric fields respectively.
