<a href="<?php echo wp_logout_url( home_url() ); ?>" class="head-a ">


function redirect_after_logout() {

	$current_user   = wp_get_current_user();
	$role_name      = $current_user->roles[0];

	if($role_name == 'subscriber'){
			$redirect_url = site_url();
			wp_safe_redirect( $redirect_url );
			exit;
	}

}
add_action( 'wp_logout', 'redirect_after_logout'  );