Superconductivity in iron-based layered materials has provided new optimism in the search for novel high-temperature superconductors. Recently intercalation of respectively alkali metals and ammonia has been shown to tune superconductivity in FeSe. We systematically synthesize using a special low temperature technique (NH3)yMxFeSe and study the relationship between doping, structure - notably separation between layers - and superconductivity. We have discovered that depending on ammonia concentration and alkali metal choice the system separate into distinct phases each with specific Tc. Here we proposed a high resolution powder diffraction experiment on phase pure (NH3)yCs0.4FeSe and (NH3)yNaxFeSe in order to determine the position and site occupancies of the alkali and ammonium groups.