My guess and this is just an educated guess:
Departments with a lot of overlap, easily contracted out to third parties, or be handled by a central team will be the first to get layoffs.
HR, some marketing, IT which is already contracted out, website people (BAS has two, don't know about other divisions), and branding people are the highest risk.
Graphics, Finance, and Doc Control people are wild cards.
Quality, R&D, field assurance, and most product teams I bet are the safest, at least for now.
Here at BAS, our graphics team was let go with some marketing people. However, BAS is getting completely absorbed by BD so we saw that coming.