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First-principle FLAPW-GGA band structure calculations are employed to obtainthe structural, electronic properties and chemical bonding picture for tworelated layered phases, namely, quaternary oxyarsenides LaZnAsO and YZnAsO.These compounds are found to be direct-transition type semiconductors with theGGA gaps of about 0.65-1.30 eV. The peculiarities of chemical bonding in thesephases are investigated and discussed in comparison with quaternary oxyarsenideLaFeAsO - a basic phase for the newly discovered 26-52K superconductors.

Electronic band structures and intra-atomic interactions in layered quaternary oxyarsenides LaZnAsO and YZnAsO