After Primary Nav Menu.php

//* Register widget areas
genesis_register_sidebar( array(
	'id'          => 'after-header',
	'name'        => __( 'After Header', 'wpsites' ),
	'description' => __( 'This is the after header widget area.', 'wpsites' ),
) );

//* Hooks after-entry widget area to single posts
add_action( 'genesis_before_content_sidebar_wrap', 'after_header_widget'  ); 
function after_header_widget() {

    genesis_widget_area( 'after-header', array(
		'before' => '<div class="after-header widget-area"><div class="wrap">',
		'after'  => '</div></div>',
    ) );

}