As-grown $\mathrm{Ag}{\mathrm{F}}_2$ has an electronic structure remarkably similar to insulating cuprates, but it is extremely electronegative, which makes it hard to handle and dope. Furthermore, buckling of layers reduces magnetic interactions and enhances unwanted self-trapping lattice effects. We argue that epitaxial engineering can solve all these problems. By using a high-throughput approach and first-principle computations, we find a set of candidate substrates which can sustain the chemical aggressiveness of $\mathrm{Ag}{\mathrm{F}}_2$ and at the same time have good lattice parameter matching for heteroepitaxy, enhancing $\mathrm{Ag}{\mathrm{F}}_2$ magnetic and transport properties, and opening the possibility of field-effect carrier injection to achieve a unique generation of high-$T_c$ superconductors. Assuming a magnetic mechanism and extrapolating from cuprates we predict that the superconducting critical temperature of a single layer can reach 195 K.

AgF ₂ compressed to 150 000 atm forms a unique polymorphic form consisting of the first metal fluoride nanotubes.

The high-pressure HP2 form of AgF₂ features Ag₂F₇³⁻ units that are theoretically predicted to host extremely strong antiferromagnetic interactions, surpassing those seen in copper(ii) oxides.