[iggy1]

pawn Код:

if(pData[playerid][Admin] >= 4 || IsPlayerAdmin(playerid))
{
    //will work if the player is more than or equal to lvl 4 OR Rcon admin
}
else
{
    SendClientMessage(playerid, COLOR_RED, "*** You are not Head Administrator ***");
}

EDIT: If that doesn't work then your var isn't holding the correct value. And the player isn't rcon.