Reaction of ammonia vapor with a KC8 GIC and treatment (vacuum and heating) produces a new second stage GIC:K(NH3)(0.5)C-8 with di = 815 pm. The stage 1 GIC can be obtained by reaction with potassium vapor. Similar treatment with KC24 leads to a stage 2 GIC:K(NH3)(1.3)C-24 with a smaller di = 648 pm Synthesis conditions and organisation of the intercalated layers are discussed.