What way it is to be to get two GET methods in the URL by htaccess?

RewriteRule ^adm/(.*)$ adm.php?mode=$1

I've used that for the example URL:

http://www.domain.com/adm/thismode

Now I want to get two methods like:

http://www.domain.com/adm/thismode/othermode

I've tried this:

RewriteRule ^adm/(.*)$/(.*)$ adm.php?mode=$1&othermode=$2

But doesn't seem to work... how do I get it to do that?

EDIT:

$mode1 = $_GET['mode'];

$mode2 = $_GET['othermode'];

Like this...