For everyone concerned about or experiencing layoffs, I just released this Laid Off Toolkit full of totally free apps, tools, and resources to help job seekers go from laid off to landing better offers.
You'll find Salary Toolkits (calculators, databases, and negotiation templates), Interview questions and strategies, resume ATS screeners and builders, career direction matrices, and more.
See it here:
I tried this and ended up burning some bridges. If you guys have an agreement, respect that unless you have another counter offer/some kind of leverage for yourself.
If you don't have any other offer in hand, its not wise to renegotiate. Things could backfire. Try to get a better offer and then you can show them and ask to match the offer.