android how to change <item> width and height

[tapoccark]

i'm making a layer-list for drawable...i have my background image, and i want the second layer to be smaller,but it seems that not matter what i'm writing inside my android:layer_width\heightthe second layer size remain the same..this is my xml:\[code\]<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="wrap_content"android:layout_height="wrap_content" ><item android:drawable="@drawable/picuser" android:layout_width="50dp"android:layout_height="50dp"/><item android:drawable="@drawable/ic_launcher" android:layout_width="10dp"android:layout_height="10dp"/></layer-list>\[/code\]