Again we have the syncopation of the bass line. This 
simulates the "repinique" or just "repique" (a small 
"surdo" used in "batucadas"), playing the off-beat.

You can also syncopate the 1st beat by an 8th note:

Musical examples:

Example 1 is a transcription of the rhythm guitar part 
played by Ivan Lins on the song "Desesperar, jamais" 
(Ivan Lins / Victor Martins), as recorded on the album 
"Ivan Lins, A noite" -- EMI, 1979.

Notice the use of open strings chord voicing and the 
shifting between low and high voices.

Example 2 uses "variation #4" on the last two bars. 
The chord progression is very typical in samba style 
and you can find it in many tunes.