Citation: Abakumov, Artem M.; Tsirlin, Alexander A.; Bakaimi, Ioanna; Van Tendeloo, Gustaaf; Lappas, Alexandros (2014). Multiple Twinning As a Structure Directing Mechanism in Layered Rock-Salt-Type Oxides: NaMnO2Polymorphism, Redox Potentials, and Magnetism. Chemistry of Materials, , pp. 140509152558002-.