[...] the ungrammaticality of forms such as "*employmental", "*discernmental" etc. [Aronoff, Mark, 1976, “Word formation in generative grammar” (Linguistic Inquiry Monographs; 1), MIT Press, Cambridge MA] can neither follow from nor give rise to the generalisation that "-al" is a "stratum-1 suffix", and "-ment" a "stratum-2 suffix", in absolute terms [...].
- Giegerich (2004), Pag. 186