First, for reference:
The subject of feel in samba is intimidating because it has never been clearly and fully analyzed, at least that I've seen. Here in their entirety are three of the most helpful things I've read about it:
Duduka da Fonseca/Bob Weiner in Brazilian Rhythms for Drumset: One of the keys to understanding Brazilian music is feel the pull towards a "triplet pulse" against the 2/4 feel of the samba.
Eliane Elias quoted by Peter Erskine in The Drum Perspective: "You Americans don't know how to swing samba; you all sound like TI-KA TI-KA TI-KA TI-KA." I smirked and said, "Well then, how should it sound?" She sang, "DO-goosh-ga, DO-goosh-ga, DO-goosh-ga, DO-goosh-ga."
Peter Erskine in Drum Concepts and Techniques: Remember to accent on 2.