polymerchemist,
My Wife needed to do this for her job here in Qatar. She had the report notarized by the police dept in the states, gave it to her company and they had it "authenticated" by the US State dept. Once the whole batch of them for the entire project staff arrived here in Qatar, it was pointed out that they needed to be "authenticated" by the Qatari Embassy in Washington D.C.. SO, off went the lot of them back to the States for this. Don't take any chances that what you bring or have sent is not enough. Do everything possible to have the proper seals and signatures before you arrive. This will limit the amount of "red tape" you encounter.
Another bit of advice I will give is to get your international driving license from AAA. It is "good" for six months upon your arrival and will enable you to rent a car immediately. Otherwise, you must wait for the entire visa process to reach completion before you are able to get a driving license. Take oit from someone who came to Doha without his "ducks in a row". I am still waiting on my residency visa and have been here in Qatar since the 1st of July. I do not wish to see/hear of anyone having to go through what I am enduring.

-Steve-O