How to add some code (guess css) in header?

I am tring to create a theme and here I stacked. I want to add a slider in homepage only. o it is pointless to add that css in styles.css. I created a file in theme/layout/slider.css. my homepage is static page. I want to add slider.css for my homepageonly (obbhome.php).
Here is my code.

<?php
    add_action('wp_head', 'slider_css');
    function slider_css(){
?>

<link rel="stylesheet" type="text/css" href="<?php echo get_template_directory_uri(); ?>/layouts/slider.css">
<?php
   }
?>

But it doesn’t work. nothing happen. so how to add some code in head tag?