Arranging the rhythm part of the guitar.

Arranging is the process by which you decide and "arrange" a particular song before you record it.  When coming up with the arrangement for the rhythm guitar part/parts of a song, you should think of the voicing you will use.  

Voicing is the register (highness or lowness of notes) used when playing the chords of the song.  For example, a chord could be played in at least in 3 different ways.  Here are 3 examples to look at:  

One: in the lower register (power chord). 

Two: in the mid register (such as an open chord).

Three: in a higher register (a bar chord).  

Registers could be looked as the place in the neck of the instrument.  The lower register is closer to the tuning pegs, and the higher register is closer to the sound hole.  That is a good rule of thumb!

The rhythmic part of those 3 voicing forms (within the same song) should be decided by the groove and rhythm set by the percussion arrangement and bass groove.  

You don't want to clash all the chords and their rhythmic patterns.  For example, you may want to strum more aggressively and continuously a mid register chord, just strum once the power chord that goes with it…and the upper register chord?  Well, how about arpeggiating it!  

These are all tricks that one could think of when getting to the task of the arrangement in a song.  This should all be done as a PRE-RECORDING/PRODUCTION task.  Do not take it lightly, as the arrangement of the rhythm part IS crucial to setting the groove for the song, and even giving it a genre!