semantic head

[Azita Abbassi (by way of Martha McGinnis)]

Dear List-ers

In derivatves like "institution" which part is the semantic head? the
base or the suffix?

I am working on productivity in Persian morphology. A part of my
research is about the semantic head of derivatives . The model I am
working with is DM , but I have not found any literature concerning
how DM deals with the notion SEMANTIC HEAD in derivatives. I will be
glad to know if any one has worked on the subject.

thank you in advance,
Azita