  The comparative study of structural, electronic properties, topology of the
Fermi surface, and the features of chemical bonding in layered
1111-oxyarsenides LaRhAsO and LaIrAsO has been performed based on the results
of ab initio modeling of their electronic structure. It was established that
only weak sensitivity with respect both to electron and hole doping is expected
for LaIrAsO being non-magnetic metal, however, the Rh-containing compound
should be characterized with weak band magnetism, and the hole doping is
expected to be able to move its ground state away from the boundary of magnetic
instability. The mentioned feature allows to consider LaRhAsO oxyarsenide as a
possible "electron analogue" of LaFeAsO compound being the initial phase for
the layered FeAs-superconductors.
