The Tampa 2 defense is one that relies on a slightly different version of the traditional cover 2. The corners are fade to flat players, the safeties are deep 1/2 players, the Sam and Will linebackers are seam players and the Mike is a deep run thru player (17 - 22 yards). Below is a diagram of Tampa 2:
You can see this concept online if you click on the following link: http://patngo.com/film.php?id=91. Pat N Go is a great website that has a plethora of playbooks and game film!!
Now, you can run Tampa 2 with a 4 down or a 3 down front and it can be a 4 man or 3 man rush call. At Liberty we played what was called "Okie Tony" as our base call and the Jack linebacker was the run - thru and the Mike played the low hole. This concept can also be played with dime personnel and the Jack linebacker is replaced with a defensive back. This concept is illustrated below:
Tampa 2 is a great coverage that has its strengths and weaknesses but it has stood the test of time. I read that Lovie Smith is going to run it down in Tampa Bay. Maybe they can party like it is 2002....