Layout_anchor equivalent for ConstraintLayout code example

Example: Layout_anchor equivalent for ConstraintLayout

<android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/activity_horizontal_margin"
        android:scaleType="center"
        android:src="@drawable/ic_star"
        app:fabSize="mini"
        app:layout_constraintBottom_toBottomOf="@+id/above_layout"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/above_layout"/>