The most important of his thirty-three literary productions is a compendium of moral theology, Theologia Moralis in quinque libros partita (Munich, 1625), of which a second and enlarged edition in six volumes appeared in 1626 at the same place.
The reason why Laymann is often represented as an advocate of the horrible cruelties practised at trials for witchcraft lies in the assumption that he is the author of a book entitled Processus juridicus contra sagas et vene fico (Cologne, 1629).
At the instance of Bishop Heinrich von Knöringen of Augsburg, Laymann wrote Pacis compositio inter Principes et Ordines Imperii Romani Catholicos atque Augustanæ Confessionis adhærentes (Dillingen, 1629), an elaborate work of 658 pages, explaining the value and extent of the Religious Peace of Augsburg, effected by King Ferdinand I in 1555.
Cardinalium, episco porum, principum et alioram, demum minimæ Societatis Jesu, in causa monasteriorum extinctorum et bonorum ecclesiasticorum vacantium .
His work on canon law, Jus Canonicum seu Commentaria in libros decretales (3 vols., Dillingen, 1666–98), was published after his death.