two Heders in table

If you want to repeat the header by interval, you can do something like that:

$table = get_field( 'your_table_field_name' );

if ( $table ) {

    echo '<table border="0">';

        echo '<tbody>';

            $i = 0;
            $header_interval = 10;

            foreach ( $table['body'] as $tr ) {

                // header cells by interval

                if ( $i === $header_interval ) {

                    $i = 0;
                }

                if ( $table['header'] AND $i === 0 ) {

                    echo '<tr>';

                        foreach ( $table['header'] as $th ) {

                            echo '<th>';
                                echo $th['c'];
                            echo '</th>';
                        }

                    echo '</tr>';

                    $i = 0;
                }

                $i++;

                // normal cells

                echo '<tr>';

                    foreach ( $tr as $td ) {

                        echo '<td>';
                            echo $td['c'];
                        echo '</td>';
                    }

                echo '</tr>';
            }

        echo '</tbody>';

    echo '</table>';
}

There is no option yet for a row to define the type of that row´s cells.