Sure, at least with Resharper 5.1.1727 you can add an entry like the following
<!--fields-->
<Entry>
<Match>
<Kind Is="field"/>
</Match>
<Sort>
<Static/>
<Readonly/>
<Name/>
</Sort>
</Entry>
to the Type Members Layout to indicate where you want the backing fields to appear in the class.
For example, if you want fields at the bottom of the class insert that section as the very last entry in the Default Pattern section:
<!--Default pattern-->
<Pattern>
Resharper 5.1 comes with a default entry that includes fields:
<!--fields and constants-->
<Entry>
<Match>
<Or>
<Kind Is="constant"/>
<Kind Is="field"/>
<Kind Is="event"/>
</Or>
</Match>
<Sort>
<Kind Order="constant field"/>
<Static/>
<Readonly/>
<Name/>
</Sort>
</Entry>
so that it will not conflict with your new rule, remove field from the default entry e.g.
<!--events and constants-->
<Entry>
<Match>
<Or>
<Kind Is="constant"/>
<Kind Is="event"/>
</Or>
</Match>
<Sort>
<Kind Order="constant event"/>
<Static/>
<Readonly/>
<Name/>
</Sort>
</Entry>