The IC confused me for a good portion of the movie. I wasn't sure who could have a recognisable impact on the MC since everyone was being so secretive. It wasn't until after the credits began rolling that everything clicked for me and I realized that same IC handoff (assuming we're on the same page).
@Alejandro, I will be the first to say I didn't like The Martian as much as I would have liked, but I'll try not to let that infringe on my storyform opinion. Like you, I can't pick out a single candidate for IC, because there's nobody that Matt Damon (obvious MC) really comes into conflict with. He has one scene that I can remember in which he argues with someone through a computer. There's no subjective story in the movie, either, so it must be a tale. It's all objective story (Physics -- rescuing him) told through two groups of people, and one Main Character throughline (Universe -- survive until they find him). I'm not convinced it could be anything other than a tale.
The only other movie I've seen recently worthy of any analysis would be Ninotchka (1939), which I found to be completely charming.