Android how to fill a relative layout inside scroll view to full screen

i can't fill my relative layout on full screen. when a make another layout for example in bottom, he will just appear after the last layout. this is my code

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".android_app_activity.EspacePersonnelActivity"
    android:layout_width="fill_parent"
    android:background="@drawable/ep_background"
    android:id="@+id/espacePersonnelLayout"
    android:layout_height="fill_parent">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >...