Environmentally stable delta (layered) phase of MnO₂ has been synthesized using float zone technique at centimeter scales. In its delta-phase, MnO₂ crystal structure assumes R-3m phase (see images) which contains layers stacked onto each other vdW bonding. Each layer has three atomic thick arrangement consisting of O-Mn-O layers as shown in the diagram in product images. In the bulk form, MnO₂ has 1.5 eV predicted band gap while it has been anticipated to increase to 2.0 eV in the monolayer form [1]. The material is environmentally stable in air, water, and different gases. Layers can easily exfoliated onto desired substrates with minimal efforts as shown in the product images. 

Atomic depiction of MnO2 layers：

 Lattice Parameters of MnO2：

Raman Spectrum of MnO2 crystals：

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