Basically, they pay you out for the remainder of the week and then give you two weeks short notice pay and paid for un-used PTO. After that you can opt to take the 2 week/yr payout (52 wk max) as a lump sum or have it paid bi-weekly as regular pay. If you elect the biweekly payout then your medical benefits continue. You don't get any 401K contributions only medical benefits. No medical benefits (other than COBRA) for lump sump. If you are over a certain age then you sign a waiver that says you won't sue for age discrimination to get severance (but you'll get the 2 week short notice and PTO pay regardless). Salary is taxable (lump sum get hits at payout) and unemployment benefits kick in vary by state (as I understand it). Best of luck.
Bumped from @XW9IgLL-1bls for important info.