Ab initio exploration of d0 digital magnetic heterostructures: the case of MgO and CaO δ-doped with potassiumJiangtao Du, Shengjie Dong, Yi-Lin Lu, Hui Zhao, Liying Wang and Liefeng FengEur. Phys. J. B, 90 6 (2017) 118DOI: https://doi.org/10.1140/epjb/e2017-70495-y