Citation: M\; aczka, Miros\/law; Ptak, Maciej; G\; agor, Anna; Stefa\'nska, Dagmara; Sieradzki, Adam (2019). Layered Lead Iodide of [Methylhydrazinium]2PbI4 with a Reduced Band Gap: Thermochromic Luminescence and Switchable Dielectric Properties Triggered by Structural Phase Transitions. Chemistry of Materials, 31, pp. 8563-.