After a stellar opening day of $51.2 million last Friday, Iron Man 2 fell a steep 71% to gross $15 million a week later. The superhero flick is likely well on its way to $300 million, but the chasm between Tony Stark and Robin Hood is not quite as wide as you might have imagined, as the Ridley Scott reboot earned $13.1 million on Friday.  In an appeal to the fairer gender, Letters to Juliet earned a respectable $5 million.  Rounding out the top five, the basketball-centric Just Wright netted $2.9 million, and Nightmare on Elm Street scared up another $1.2 million.  Check back tomorrow to see if noble thief Robin Hood can steal the crown from Iron Man 2 over the weekend.