res/drawable/leftdrawer_layer1x2.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/first_image1" >
      <bitmap android:src="@drawable/module_1x2_face_regular"
       />
    </item>
    <item android:id="@+id/second_image1" >
     <bitmap android:src="@drawable/module_1x2_side_regular"
       />
    </item>
</layer-list>